Note 2 - Fair Value Measurements (Details) - Fair Value Measurements on a Recurring Basis (USD $) In Millions, unless otherwise specified	Sep. 29, 2013	Dec. 30, 2012
Note 2 - Fair Value Measurements (Details) - Fair Value Measurements on a Recurring Basis [Line Items]
Money market funds	$ 2.8	$ 2.3
Available-for-sale investment	76.3	37.7
Total assets at fair value	79.1	40.0
Fair Value, Inputs, Level 1 [Member]
Note 2 - Fair Value Measurements (Details) - Fair Value Measurements on a Recurring Basis [Line Items]
Money market funds	2.8	2.3
Available-for-sale investment	76.3	37.7
Total assets at fair value	79.1	40.0
Fair Value, Inputs, Level 2 [Member]
Note 2 - Fair Value Measurements (Details) - Fair Value Measurements on a Recurring Basis [Line Items]
Money market funds	0	0
Available-for-sale investment	0	0
Total assets at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Note 2 - Fair Value Measurements (Details) - Fair Value Measurements on a Recurring Basis [Line Items]
Money market funds	0	0
Available-for-sale investment	0	0
Total assets at fair value	$ 0	$ 0